Description
Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mozilla Firefox
128.11 to ≤ 128.*unaffected139 to ≤ *unaffected
Mozilla Thunderbird
128.11 to ≤ 128.*unaffected139 to ≤ *unaffected
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1965628 ↗
- https://www.mozilla.org/security/advisories/mfsa2025-42/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-44/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-45/ ↗
- https://www.mozilla.org/security/advisories/mfsa2025-46/ ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00043.html ↗